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    <title>Icon sprites with WebGL example</title>
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          <h4 id="title">Icon sprites with WebGL example</h4>
          <p id="shortdesc">Icon sprite with WebGL</p>
          <div id="docs"><p>In this example a sprite image is used for the icon styles. Using a sprite is required to get good performance with WebGL.</p>
</div>
          <div id="tags">webgl, icon, sprite, vector, point</div>
          <div id="api-links">Related API documentation: <ul class="inline"><li><a href="../apidoc/ol.Feature.html" title="API documentation for ol.Feature">ol.Feature</a></li>,<li><a href="../apidoc/ol.Map.html" title="API documentation for ol.Map">ol.Map</a></li>,<li><a href="../apidoc/ol.View.html" title="API documentation for ol.View">ol.View</a></li>,<li><a href="../apidoc/ol.geom.Point.html" title="API documentation for ol.geom.Point">ol.geom.Point</a></li>,<li><a href="../apidoc/ol.layer.Vector.html" title="API documentation for ol.layer.Vector">ol.layer.Vector</a></li>,<li><a href="../apidoc/ol.source.Vector.html" title="API documentation for ol.source.Vector">ol.source.Vector</a></li>,<li><a href="../apidoc/ol.style.Icon.html" title="API documentation for ol.style.Icon">ol.style.Icon</a></li>,<li><a href="../apidoc/ol.style.Style.html" title="API documentation for ol.style.Style">ol.style.Style</a></li></ul></div>
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        <form method="POST" id="jsfiddle-form" target="_blank" action="http://jsfiddle.net/api/post/jquery/1.11.0/">
          <textarea class="hidden" name="js">var iconInfo &#x3D; [{
  offset: [0, 0],
  opacity: 1.0,
  rotateWithView: true,
  rotation: 0.0,
  scale: 1.0,
  size: [55, 55]
}, {
  offset: [110, 86],
  opacity: 0.75,
  rotateWithView: false,
  rotation: Math.PI / 2.0,
  scale: 1.25,
  size: [55, 55]
}, {
  offset: [55, 0],
  opacity: 0.5,
  rotateWithView: true,
  rotation: Math.PI / 3.0,
  scale: 1.5,
  size: [55, 86]
}, {
  offset: [212, 0],
  opacity: 1.0,
  rotateWithView: true,
  rotation: 0.0,
  scale: 1.0,
  size: [44, 44]
}];

var i;

var iconCount &#x3D; iconInfo.length;
var icons &#x3D; new Array(iconCount);
for (i &#x3D; 0; i &lt; iconCount; ++i) {
  var info &#x3D; iconInfo[i];
  icons[i] &#x3D; new ol.style.Icon({
    offset: info.offset,
    opacity: info.opacity,
    rotateWithView: info.rotateWithView,
    rotation: info.rotation,
    scale: info.scale,
    size: info.size,
    src: &#x27;data/Butterfly.png&#x27;
  });
}

var featureCount &#x3D; 50000;
var features &#x3D; new Array(featureCount);
var feature, geometry;
var e &#x3D; 25000000;
for (i &#x3D; 0; i &lt; featureCount; ++i) {
  geometry &#x3D; new ol.geom.Point(
      [2 * e * Math.random() - e, 2 * e * Math.random() - e]);
  feature &#x3D; new ol.Feature(geometry);
  feature.setStyle(
      new ol.style.Style({
        image: icons[i % (iconCount - 1)]
      })
  );
  features[i] &#x3D; feature;
}

var vectorSource &#x3D; new ol.source.Vector({
  features: features
});
var vector &#x3D; new ol.layer.Vector({
  source: vectorSource
});

var map &#x3D; new ol.Map({
  layers: [vector],
  target: document.getElementById(&#x27;map&#x27;),
  view: new ol.View({
    center: [0, 0],
    zoom: 5
  })
});

var overlayFeatures &#x3D; [];
for (i &#x3D; 0; i &lt; featureCount; i +&#x3D; 30) {
  var clone &#x3D; features[i].clone();
  clone.setStyle(null);
  overlayFeatures.push(clone);
}

var featureOverlay &#x3D; new ol.layer.Vector({
  map: map,
  source: new ol.source.Vector({
    features: overlayFeatures
  }),
  style: new ol.style.Style({
    image: icons[iconCount - 1]
  })
});

map.on(&#x27;click&#x27;, function(evt) {
  var info &#x3D; document.getElementById(&#x27;info&#x27;);
  info.innerHTML &#x3D;
      &#x27;Hold on a second, while I catch those butterflies for you ...&#x27;;

  window.setTimeout(function() {
    var features &#x3D; [];
    map.forEachFeatureAtPixel(evt.pixel, function(feature, layer) {
      features.push(features);
      return false;
    });

    if (features.length &#x3D;&#x3D;&#x3D; 1) {
      info.innerHTML &#x3D; &#x27;Got one butterfly&#x27;;
    } else if (features.length &gt; 1) {
      info.innerHTML &#x3D; &#x27;Got &#x27; + features.length + &#x27; butterflies&#x27;;
    } else {
      info.innerHTML &#x3D; &#x27;Couldn\&#x27;t catch a single butterfly&#x27;;
    }
  }, 1);
});

map.on(&#x27;pointermove&#x27;, function(evt) {
  if (evt.dragging) {
    return;
  }
  var pixel &#x3D; map.getEventPixel(evt.originalEvent);
  var hit &#x3D; map.hasFeatureAtPixel(pixel);
  map.getTarget().style.cursor &#x3D; hit ? &#x27;pointer&#x27; : &#x27;&#x27;;
});
</textarea>
          <textarea class="hidden" name="css"></textarea>
          <textarea class="hidden" name="html">&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div class&#x3D;&quot;span2 offset2 pull-right&quot;&gt;
      &lt;div id&#x3D;&quot;info&quot; class&#x3D;&quot;alert alert-success&quot;&gt;
        &amp;nbsp;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;
</textarea>
          <input type="hidden" name="wrap" value="l">
          <input type="hidden" name="resources" value="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css,https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js,http://openlayers.org/en/v3.11.1/css/ol.css,http://openlayers.org/en/v3.11.1/build/ol.js">
        </form>
        <pre><code id="example-source" class="language-markup">&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;title&gt;Icon sprites with WebGL example&lt;/title&gt;
&lt;script src="https://code.jquery.com/jquery-1.11.2.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"&gt;
&lt;script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"&gt;&lt;/script&gt;
&lt;link rel="stylesheet" href="http://openlayers.org/en/v3.11.1/css/ol.css" type="text/css"&gt;
&lt;script src="http://openlayers.org/en/v3.11.1/build/ol.js"&gt;&lt;/script&gt;

&lt;/head&gt;
&lt;body&gt;
&lt;div class="container-fluid"&gt;

&lt;div class&#x3D;&quot;row-fluid&quot;&gt;
  &lt;div class&#x3D;&quot;span12&quot;&gt;
    &lt;div id&#x3D;&quot;map&quot; class&#x3D;&quot;map&quot;&gt;&lt;/div&gt;
    &lt;div class&#x3D;&quot;span2 offset2 pull-right&quot;&gt;
      &lt;div id&#x3D;&quot;info&quot; class&#x3D;&quot;alert alert-success&quot;&gt;
        &amp;nbsp;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
&lt;/div&gt;

&lt;/div&gt;
&lt;script&gt;
var iconInfo &#x3D; [{
  offset: [0, 0],
  opacity: 1.0,
  rotateWithView: true,
  rotation: 0.0,
  scale: 1.0,
  size: [55, 55]
}, {
  offset: [110, 86],
  opacity: 0.75,
  rotateWithView: false,
  rotation: Math.PI / 2.0,
  scale: 1.25,
  size: [55, 55]
}, {
  offset: [55, 0],
  opacity: 0.5,
  rotateWithView: true,
  rotation: Math.PI / 3.0,
  scale: 1.5,
  size: [55, 86]
}, {
  offset: [212, 0],
  opacity: 1.0,
  rotateWithView: true,
  rotation: 0.0,
  scale: 1.0,
  size: [44, 44]
}];

var i;

var iconCount &#x3D; iconInfo.length;
var icons &#x3D; new Array(iconCount);
for (i &#x3D; 0; i &lt; iconCount; ++i) {
  var info &#x3D; iconInfo[i];
  icons[i] &#x3D; new ol.style.Icon({
    offset: info.offset,
    opacity: info.opacity,
    rotateWithView: info.rotateWithView,
    rotation: info.rotation,
    scale: info.scale,
    size: info.size,
    src: &#x27;data/Butterfly.png&#x27;
  });
}

var featureCount &#x3D; 50000;
var features &#x3D; new Array(featureCount);
var feature, geometry;
var e &#x3D; 25000000;
for (i &#x3D; 0; i &lt; featureCount; ++i) {
  geometry &#x3D; new ol.geom.Point(
      [2 * e * Math.random() - e, 2 * e * Math.random() - e]);
  feature &#x3D; new ol.Feature(geometry);
  feature.setStyle(
      new ol.style.Style({
        image: icons[i % (iconCount - 1)]
      })
  );
  features[i] &#x3D; feature;
}

var vectorSource &#x3D; new ol.source.Vector({
  features: features
});
var vector &#x3D; new ol.layer.Vector({
  source: vectorSource
});

var map &#x3D; new ol.Map({
  layers: [vector],
  target: document.getElementById(&#x27;map&#x27;),
  view: new ol.View({
    center: [0, 0],
    zoom: 5
  })
});

var overlayFeatures &#x3D; [];
for (i &#x3D; 0; i &lt; featureCount; i +&#x3D; 30) {
  var clone &#x3D; features[i].clone();
  clone.setStyle(null);
  overlayFeatures.push(clone);
}

var featureOverlay &#x3D; new ol.layer.Vector({
  map: map,
  source: new ol.source.Vector({
    features: overlayFeatures
  }),
  style: new ol.style.Style({
    image: icons[iconCount - 1]
  })
});

map.on(&#x27;click&#x27;, function(evt) {
  var info &#x3D; document.getElementById(&#x27;info&#x27;);
  info.innerHTML &#x3D;
      &#x27;Hold on a second, while I catch those butterflies for you ...&#x27;;

  window.setTimeout(function() {
    var features &#x3D; [];
    map.forEachFeatureAtPixel(evt.pixel, function(feature, layer) {
      features.push(features);
      return false;
    });

    if (features.length &#x3D;&#x3D;&#x3D; 1) {
      info.innerHTML &#x3D; &#x27;Got one butterfly&#x27;;
    } else if (features.length &gt; 1) {
      info.innerHTML &#x3D; &#x27;Got &#x27; + features.length + &#x27; butterflies&#x27;;
    } else {
      info.innerHTML &#x3D; &#x27;Couldn\&#x27;t catch a single butterfly&#x27;;
    }
  }, 1);
});

map.on(&#x27;pointermove&#x27;, function(evt) {
  if (evt.dragging) {
    return;
  }
  var pixel &#x3D; map.getEventPixel(evt.originalEvent);
  var hit &#x3D; map.hasFeatureAtPixel(pixel);
  map.getTarget().style.cursor &#x3D; hit ? &#x27;pointer&#x27; : &#x27;&#x27;;
});

&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;</code></pre>
      </div>
    </div>

    <script src="https://code.jquery.com/jquery-1.11.2.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
    <script src="./resources/common.js"></script>
    <script src="./resources/prism/prism.min.js"></script>
    <script src="loader.js?id=icon-sprite-webgl"></script>

  </body>
</html>
